Nowhere in that story does it say they went to the bathroom, either. But to say that they didn't do so is just silly. One could argue from silence that they didn't do so (But we know by other truths that it is not the case). Seeing you do not believe in the truths on salvation that I mentioned from Scripture, you are naturally going to take a story on it's point of slience and make it a case where none really exists.
To say that Lot being evil also equates with Him righteous in some way in God's eyes is just utter non-sense. You might as well be a Satanist and say you are a good guy while you are at it (If you are to think such a thing). For he that does evil is evil. It doesn't take a rocket scientist to figure that out.
Good guys do good.
Bad guys do bad.
It's not complicated.
It's morality 101.
Unless of course you have no moral code (Then I am arguing against a wall).